RFR: 8256485: Zero VM build broken after JDK-8254231

[Aleksey Shipilev]

On Tue, 17 Nov 2020 17:12:30 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> JDK-8254231 breaks the Zero VM build. This PR contains fixes to get it working again.
> 
> Testing: Building zero VM variant on Linux.

Marked as reviewed by shade (Reviewer).

src/hotspot/cpu/zero/foreign_globals_zero.hpp line 25:

> 23: 
> 24: #ifndef CPU_ZERO_VM_FOREIGN_GLOBALS_X86_HPP
> 25: #define CPU_ZERO_VM_FOREIGN_GLOBALS_X86_HPP

Maybe include guards should be `CPU_ZERO_VM_FOREIGN_GLOBALS_ZERO_HPP`, dropping `X86` for `ZERO`.

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PR: https://git.openjdk.java.net/jdk/pull/1265